ADU Construction in North Hollywood Around Your Trees
North Hollywood ADUs placed around the backyard trees: root zones mapped first, protected species handled under city rules, footings that span roots.
Does the tree in the backyard have to come out for the unit? We answer that on the North Hollywood lot itself, with a tape around the trunk and a walk along the drip line. Roots usually spread wider than the branches, and a footing trench cut through them can starve the tree and leave soil that settles. With the root zone mapped, we look for the footprint that leaves it alone.
City rules for protected trees
The City of Los Angeles protects several native species, among them native oaks along with the state's own sycamore, bay laurel and black walnut. Removing one, or digging inside its protected zone, needs a permit from the city's urban forestry staff, backed by an arborist report. For a tree that stays, footings near it can be hand dug, shifted, or swapped for piers and a grade beam that spans the roots. Trenches for sewer and power swing around the root zone or pass under it by boring. A kept tree on the uphill side of a sloped yard also helps hold the soil.
Fencing the root zone during the build
LADBS handles plan check for a North Hollywood ADU, and the site plan it reads shows every tree with its trunk diameter and canopy line. Before any digging, a sturdy fence goes up around each kept tree at the edge of its root zone and stays until the work is done. Inside that fence, no machines park, no soil is piled and no concrete washout is dumped. Where a footing must pass close, an arborist can watch the excavation and direct which roots may be cut cleanly.
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First, away from the root zone of any tree that stays. Inside what remains, the unit needs room within the setbacks and soil that can carry it. If the yard tilts, the sewer route adds a second filter, since waste has to fall all the way to the house connection without crossing the roots.
As long as the unit qualifies, stays on one level and holds to 500 square feet, it falls inside the package. For North Hollywood, the site plan marks every tree, its trunk diameter, its canopy and the footing layout around it, since LADBS and the city's tree staff both read it. Slope engineering and the construction are priced after the visit.
Protecting roots and leveling the pad. Bridging roots with piers and a grade beam uses more concrete and steel than a plain footing, and hand digging near a trunk is slow. Where the yard rises, the cut needs its own retaining wall. An arborist's report and site visits add their own charges.
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